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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '043a38e0fe23f9f2dac8d872be04a030d4ebb777559231b65e98b5e488faa949' 
  AND token = 'SUvlN4RBeYpuDhpkKhOcnmpAZHuSgoBn4xrHqOS95fI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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