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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '257f03a0fcee090a93542ce924e359f19a5a82692949c8ed2a50e8d359f528d2' 
  AND token = '6F/w8eqUEEo0DTx3uutXo43HtQc+bnUP8mJNiPHrE7E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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