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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '638a9f70b406ca5de9ca94f060c0ec6b88c6a79a6ac53f245031d60ae84d74ac' 
  AND token = 'quxdgN9zgJVaQxP/vgxWUfqH/b69V3Uosqii3IWkWuA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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