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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2e8f89dc338b629addf43cf93601f68cb9c8ddd5db8dc4d19acc8ddbd0c33f2b' 
  AND token = 'DE2tbphwuIH/PU4SZ3ZaQpkKlTuv+fzJ25C1Pr8/cwQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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