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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '07d25308d18d6a72a7b0697cad8baa26f88be494f6e323d66050f8f63d046be4' 
  AND token = 't0A8iavf2dshycS10uX1DEd0pA2E/qRWdoIHG3gnQ70=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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