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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '33b62f6acdbd8ba71f901d61df44f9dae6b8d5520292498f2b95d91eb219116e' 
  AND token = '+htmRYQN60ioDxAqd+eMXp4JBSFFEnFb2dvBOgtuP4c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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