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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '89299135d3223b7718baf6e8e266904ceac9d4344fa2c9f946ea9c27d5d18533' 
  AND token = '8g7jbMHi1RioP6jjLzGFHbYQz+foQnHIURZjjk7gkfA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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