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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f251510b414c76e6c91bb5d70fc69860714cb349d30c7c07af601f20e7859893' 
  AND token = 'SJ5ryZIQwTMqvBeVyE0+DWypVWLkRBjjT16krXAXrSo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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