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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd1d6804c7313763faeb380dc59545fe3082c6409290cebc9df6316189cb047ef' 
  AND token = 'PysoC6y2Q2k+QUrjy5IXmjnAPDsUNMzxbW6xMeDB7cU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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