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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '11021c9563e464b6784a15e1cbb8b5962bcf1826b45b203ec3ba93ff5c433260' 
  AND token = '9ro5AcocR56g9E60F97yONJSIHo+w1nFimUYTjwvkvQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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