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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd1b236a636dc69563e64a3e9f2c86f9776bb06655128bcaab816242d766459e' 
  AND token = '3DdSQ602alO85P4W1XEBoBU1fP5efxtsNWJWKXiF8+g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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