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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '231e541d7fa07d1afd83b6a62a07d1570bc5c9f081e265ae13539ef01d1962b3' 
  AND token = 'DhTYCO6iORAj88L8fzHMjmfB7hJbq4hcUfo4el0T80E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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