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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1920310fb5c68dcc9e6111bebc0475f759eb501c0eb6db041b624650950cb831' 
  AND token = 'TAIYU6SH4tBL7c0afElEMM5u0RPA+TZdGRSzIlos0fg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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