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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '19ef4cc726ffd48402b59b06bc230691982eac0cb95b23e07cfb79acd59645e1' 
  AND token = '0jb84B9fTcZjONgsf4E63LJNDwrJoYPmprRE1kvSqC4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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