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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e4a8808c8ef060c9707797c4c4c5025e56ab9097a592eb09f5694e3f30f4de7d' 
  AND token = 'LapY3f17MAzC3op4PHfwxUkNyFqPOgyXQSG9IpvkOcY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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