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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8e3fc5d91526de2b49e2bfa001529f1c8b8b5971be7c23a8670a6ae5b3fc1b69' 
  AND token = 'UI1ahQnh/6xQellgq2SPpsPLQegrZpf/b7hBhrdQ3e4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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