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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd961ec2ab1ff8769f849cf0438e481df34f6d5c072438b3c1cc7d867ba8a334e' 
  AND token = 'nMeEiLpWsPs9KgG7WdR5X+5yf745cYQ2+y0aPCQmR2w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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