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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c8f76c9ba4f932aa5994b9939e145bdaf560c86dc02d43d8e61025b71197575d' 
  AND token = 'PVDnQiPERsPjSFZqTE807/mCmfM7LG5J2NWt9ti1aiU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

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