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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c85a60ce9d8c9396a7297f8788f33971cccc0cb08cd2554319cdd4c64ce210b0' 
  AND token = 'U1vi5ALSmMwzb6FpUKfwa1HlTDdbVoL5aDS5YcwYg+o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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