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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ea25ce808753ba235e50d5ae9679b9c25006d0138d55148998d9bb52bbc2168a' 
  AND token = 'O2BdemKB9mqqxaaYNfQi6cZhONp5obdF0vrJVuglVHs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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