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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd59bddb1dd1635bbffd3492b720a4ec3446ff04b17fc7cb2640b6878d9614454' 
  AND token = 'PmWbvAVcBLkUzKnHkLB3bE2h7t9D0oPT8uZITm2ylJ4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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