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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '894a633e0da57d0c4f321711eb98e26074b4d0cef5cf1c1aac70753d2625392c' 
  AND token = 'JEzOnyOmc4a8jLzJBa0tMeS37fZH9a7bD9YfFC+0X2g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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