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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2db5b7af1ef07bad37a28f606633594d935fa868cd980ac8fae7a334f0e97dff' 
  AND token = 'K8r7DP7/A1DbQph+6pMgNopmyK6bR4aMeF4y2mANvSs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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