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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7f98319207c30649e7c11949174e3eb20ca50e3576110d13761588952217517e' 
  AND token = 'snT5J+KMftLNbHt/Gce3MhmPqa28WR3AdK27NG9mqhM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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