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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cce5eede8fccb8c956039402b1e59932389c170874f3404ffe3aee48b3aa0fb4' 
  AND token = '5efSCneHkwi5te6tl9nCy1v0LWw0KdZzwNr/Nz1pNeQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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