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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1462793795de08b6b37e3391cc7a62c1e39cd43941b193a7f11771f1cb6b5870' 
  AND token = 'NgikAr4oiH0C1gdwDPDzEuXzEayB6FUCYsD3fkYeJEU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00063

JSON explain

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