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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '80a0d70adacf14effecef82bbf94e73eb308c4027e4f565660826a57146ed38d' 
  AND token = '5/c+wHgUIK3fjBcWn7p9NxLoLjBcaFc2rPCQz4xiEeg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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