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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e466fb8a4aea800285023a1a6c31ecea43c2ecf918d43ff553abdbfb6cc58d93' 
  AND token = 'lyefDLtFCTJ8etA9h/k8n5R2NegffvQjtCcSs8Ocjyo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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