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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5ff45364f645928f56ea144ef1e973b11a4f52777a54db57da69ebcebf0a41e7' 
  AND token = 'LW1CX78/NTo/3G/paBl3ozjjyDJ7PYVdhrL9YFfujLE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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