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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4da3d29c53098774662810df54b03d3ab9f0d5f075877d778184ff61ccc3d82f' 
  AND token = '7uf5RXgAfo4HifDjnI+0eQkVospP7NnuzVp4vcj4sJs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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