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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '737f31658cb415210cb64e92fdee71cdcf28af1fb241e9dc80f70ab436c699d6' 
  AND token = 'IaY26JQ0F4ZsZ5C20kUqji1PdErrmK0v5ZvNgovJ5/M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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