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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cc439c0ba93ff0109d3dff3e9c5b800402f159b4cb3abe856a552cbbee979d7c' 
  AND token = 'GdVU6DS6Wg423rqjjX1bsEQ5vKKj1VVgDxZpH6SOAHY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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