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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a9faf1777867219b2cfa9de88ec185942d0157172afd766f79caf88ee476861a' 
  AND token = '9MDN86aH0WmkM5s3cVFJh7KPIiUKcwQlAWs7HIL1Vrc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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