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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9070ca8152bc44f2ff3e93c36e9bfdeeb4e88b2b8e7ebc7427a89badade93ea6' 
  AND token = 'y61WUIwPxk73olcTZ5P/od+zU40qbaYdSvixwyHe3uo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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