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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4095baad895c5380ff78fb4ee1754fa5cd37a8bfca4926bcc57f4c9aa99e5a30' 
  AND token = 'z/XL72QSlP/jbBTRBZs3YA6J8o75hraZpBAXUHrH560=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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