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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ead185a43574cd169a9ddf5eceddb4bc270e69c485e668ea8a443f36a36be8dc' 
  AND token = 'Z29VMpRSnzYUBonlbwr2CsbG/JBaMs6j5kZR87be6JA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00074

JSON explain

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