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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bec05407ae888a5c57b7f355ff80448f33c2b4b59d91acc26eac0f33f648cbd9' 
  AND token = 'Jx+kD6JeiDaQN+Ny4rblQDk/kf8pIglEsSCl08bJE8Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00173

JSON explain

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