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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ef0b0ced9359b7b5bb6dd7ef7d89afa4e7393c07d54863e1080e2269871869b7' 
  AND token = 'Aex5c6C+CTgwDak+9W2VShonZcakuUR1kOd9mvfOGIM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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