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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '62cffe0050f666742b4a2a55226bce79e2aca4fe88df00922c14312e98fe194e' 
  AND token = 'aANX+qtHv44QGpsoY7XCMtSPbo6ZmDniX82QMXXh1GM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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