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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd553a448a06af861a422265f1671e5ea83dbbd1bd3e8313a699e10841011e328' 
  AND token = 'gcksUNz8Nl4M+nQDZcnS/n9s7MjYXdL1SBVdhhc+PkA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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