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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1059460134b186f5ddabe88be4f1f8f136fc68fbe2250a407b9483d34c618fe5' 
  AND token = 'Lrt8C7gYsmeh4wuyu2FvVsijk8ahCNbdGXMMQfzJ96A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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