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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f848dba2e8cd71ed0c3579928b64c94eaef6c8dbb84852a7e38e70f87e684c33' 
  AND token = 'zBx26PooYNufiXM1V280RHCotp2wFZ9aozWCl+Ckouk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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