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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '51fd7991dd5b6e8454b6a6bc04fda80344de318ba0d9fb6153cfa2f5f48d7cec' 
  AND token = 'G+M+gUH4Fm6EbB42gfuQx8a+rxTRZTyjAICGq+FZT3c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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