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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0eb4f619083d48456e0ba201ff4d809d12298368d2d8303dc83789f934f74707' 
  AND token = 'SZLaBZUtMrzJXP9Cza2cIXzVKeTtw6eBzUQP5iQ0sQY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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