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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1938f3c87a778bf18b9afe61ff2174fccab63fbfd2b56ef25adf7a41af956095' 
  AND token = 'bpoNK2n8mnnUIBNoHwvQw7ZchZNE4tgSxz5hF/dy1S8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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