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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5bd9ee3823d5dd79f0cc11db0d4a13cb765b2293edd9090dd222d833ca58f72d' 
  AND token = 'N5vg0ZheGXif4euPii4/VEqOKpTkckIrnCJWfyHY0sk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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