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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '60b45c39da54d7036afcb325341f7713c210d209aa1c11b6787a5acee50c7246' 
  AND token = 'F8HyEFpgn4uXlzZnUSo4ZW5+N8te3jkbWsqUi3kZ/y4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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