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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ca52c68d34bcb63d544d08f98000dc2b2e2f1a09ddbc0c70d2a49b728e801c17' 
  AND token = 'bal1+rW4bXvA+XUX+xR8R+RRnWGmiURY8xmxRsx8fBY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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