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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f1c01ef359f5ba4540525289517e663b01fec3ef85b837b71ac06ace8bc5d505' 
  AND token = 'XzMeKhaXyjaojHPT5Oc2N4IUT/A3MgYctW6kZZNyDOk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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