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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '588e6f5aff5c3ead92eec151515241cf87603a15070c820816926bb313b309f7' 
  AND token = 'Dhqb8k3LbtRWjp5VpBUXhOC8Y+tfX0TXv6ZcVm0E3mg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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