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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'beeb046dfcc935845e692e4404e564fe227258f0e564e84429ac160c2d5247b0' 
  AND token = 'yBj4FdR3qLlxMZjzI+up3ri7AgVMbVkym3bHKQitD+Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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