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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc975516c43ea9db617b2fe98e5e4e9241c03b2413c88103cd0807c1257c98ae' 
  AND token = 'MHw2fS1OffpkJtvls4Z07pLcTQFRJHlKwFqOiX3HTo8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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