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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3bae18bca591377a15ed975ec0b128de2505f2ccb611d695206e4ecd699a67a0' 
  AND token = 'ZdANudXbSiBGMcvto9rzxWbdKcN6tW2pmBU6a7HEhWg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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