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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab692b3798079ec459afd7fc6b9d2352469c6b5697da67bc5e2a32887a22ad99' 
  AND token = '1WB8j7W72HX4yzJ1aQmNe4yAl1b7iesAng3NlwhoOtk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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