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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '89a37cebc94389cf902e952fdfbcf962cec9f4cf80401e6464ee2d363877d13d' 
  AND token = 'ACrCwrGk9xMKOFFAb6C1gWCKnEVJK7P42g4wg5KWr+U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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