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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd29ad18adcfa763fe8bf9c68150c3e8cc293f4a0d804a3d99e161efc1e794d37' 
  AND token = 'U4CvEXNUqseQ+lqqeo27amZlxYPSkzq4nYCk26hpzPc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00009

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}