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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3b9bc1f85ce4ee0277fd62a6fc2a15104267894ac617a221fb092b58e8e3db63' 
  AND token = 'kWNcNch/tgO8QKJAw0GquI180B44lYJSnTEG+dyf/fQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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