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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '339e0c714e5dccdc96cdfa3c22fdcb0d650158d6476129fed37cd2367a605961' 
  AND token = 'UNhpK1ky7bMCdwW7V8lJ/Stj1k89m37IzhFCSgf/K5o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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