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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a504a1f11ec1d64ec673c9ffee0abf796251e62f6bd4c6ed18c3cc032fd56a4b' 
  AND token = 'GBncb173kXYGD1DUHLi3cJLfyOj6+Up5Xyptd/FerWk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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