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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b44a3d8264bcb0d3863f25a8985d844e29d7a12007eb7052c365a3484401aac5' 
  AND token = 'kfNGQhJifP1liE04BeXclzP4qanhhVZQeTj85zf1w0s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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