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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f19f33bf2239f6a4d2be953a110a1f6c9c10b0afe2a6a04f1cec500145b93954' 
  AND token = 'qq4i+MfsVDzZ/7KE5XC+JU27Bj0SMsKXYkpjXlum12E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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