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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'db8832eb30a40c9c5e7ed94e592bb99355f8a7cd8eb9e0cf054d6793274f8888' 
  AND token = '3rdNFUW2GqizpkAxx0Q2pG/uwbVZNaFVZK28yir7UkQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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