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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '56709296dd8305d4e279fa2db08442fa6de046f037237bff05a44a3c9b14d698' 
  AND token = 'm+qLP/DFdf+2G7k/rpzoqhnw1zULx/4Wsf1seI9N4OM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00009

JSON explain

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